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These new sensors will require robust calibration and validation datasets, but existing field-based instrumentation is limited in its availability and potential for geographic coverage, particularly for coastal and inland waters, where optical complexity is substantially greater than in the open ocean. The minimum signal-to-noise ratio (SNR) is an important metric for assessing the reliability of derived biogeochemical products and their subsequent use as proxies, such as for biomass, in aquatic systems. The SNR can provide insight into whether legacy sensors can be used for algorithm development as well as calibration and validation activities for next-generation platforms. We extend our previous evaluation of SNR and associated uncertainties for representative coastal and inland targets to include the imaging sensors PRISM and AVIRIS-NG, the airborne-deployed C-AIR radiometers, and the shipboard HydroRad and HyperSAS radiometers, which were not included in the original analysis. Nearly all the assessed hyperspectral sensors fail to meet proposed criteria for SNR or uncertainty in remote sensing reflectance (Rrs) for some part of the spectrum, with the most common failures (&gt;20% uncertainty) below 400 nm, but all the sensors were below the proposed 17.5% uncertainty for derived chlorophyll-a. Instrument suites for both in-water and airborne platforms that are capable of exceeding all the proposed thresholds for SNR and Rrs uncertainty are commercially available. Thus, there is a straightforward path to obtaining calibration and validation data for current and next-generation sensors, but the availability of suitable high spectral resolution sensors is limited.<\/jats:p>","DOI":"10.3390\/rs16071238","type":"journal-article","created":{"date-parts":[[2024,3,31]],"date-time":"2024-03-31T13:28:00Z","timestamp":1711891680000},"page":"1238","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":11,"title":["Expanded Signal to Noise Ratio Estimates for Validating Next-Generation Satellite Sensors in Oceanic, Coastal, and Inland Waters"],"prefix":"10.3390","volume":"16","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-8640-1205","authenticated-orcid":false,"given":"Raphael M.","family":"Kudela","sequence":"first","affiliation":[{"name":"Ocean Sciences Department, University of California Santa Cruz, Santa Cruz, CA 95064, USA"}]},{"given":"Stanford B.","family":"Hooker","sequence":"additional","affiliation":[{"name":"NASA Goddard Space Flight Center Code 616.2 Bldg. 28 Rm. W120D, Greenbelt, MD 20771, USA"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4129-1700","authenticated-orcid":false,"given":"Liane S.","family":"Guild","sequence":"additional","affiliation":[{"name":"Biospheric Science Branch, Earth Science Division, NASA Ames Research Center, Moffett Field, CA 94035, USA"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5848-5440","authenticated-orcid":false,"given":"Henry F.","family":"Houskeeper","sequence":"additional","affiliation":[{"name":"Applied Ocean Physics & Engineering, Woods Hole Oceanographic Institution, Woods Hole, MA 02543, USA"}]},{"given":"Niky","family":"Taylor","sequence":"additional","affiliation":[{"name":"U.S. Geological Survey Western Geographic Science Center, 350 N. Akron Rd., Moffett Field, CA 94035, USA"}]}],"member":"1968","published-online":{"date-parts":[[2024,3,31]]},"reference":[{"key":"ref_1","unstructured":"Sathyendranath, S. (2000). 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